Bainite steel or martensite steel membrane type wall tube panel bending method
A technology of membrane-type wall tube screen and martensitic steel, which is applied in the field of row-bend membrane-type wall-tube screen, can solve the problems that the elbow is difficult to correct and the row-bend area is prone to cracks, etc., and achieves the reduction of rigidity and strength, Effect of reducing heat treatment, saving cost and cycle time
Active Publication Date: 2017-02-22
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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Problems solved by technology
[0005] In order to solve the problems existing in the prior art, the object of the present invention is to provide a method that not only solves the problem that cracks are easily generated in the rows of bends, but also solves the problem that the bends are difficult to correct at a lower temperature, and at the same time reduces the cost. Bending method of bainitic steel or martensitic steel membrane wall tube panel heat treated before row bending treatment
Method used
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Embodiment
[0061] The upper water wall simulation part is taken as an example. The material of the tube screen is SA-213T91 (martensitic steel) pipe + SA-387GR91 (martensitic steel) flat steel. The manufacturing process of the tube screen is as follows:
[0062] 1. Assemble the small screen: the width of the small screen is 900mm and the length is 9m. Before the welding of the small screen, determine the row of bending areas, the bending line, the center line of the elbow and the final bending line. The distance from the bending line to the left end of the small screen is 2m and the distance to the right end is 7m.
[0063] 2. Welding small screen: Weld the flat steel and pipe fillet weld from the right end of the pipe screen to stop at 50mm beyond the bending line of the row of bending areas, and the remaining flat steel is not welded with the pipe, but only spot welded with the pipe .
[0064] 3. After 48 hours, carry out 100% MT flaw detection on the flat steel fillet weld.
[0065]...
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Abstract
The invention discloses a bainite steel or martensite steel membrane type wall tube panel bending method. The method comprises the following steps of: welding and assembling a bainite steel or martensite steel tube with a bainite steel or martensite steel flat into a small screen, determining a panel bending region and a bending start line, a bend center line and a bending end line in advance before welding, and controlling an end position of a steel flat fillet weld not to exceed the bend center line in the panel bending region during welding; carrying out panel bending treatment on the small screen; carrying out trial assembly on a plurality of small screens to form a large screen, and accordingly correcting the panel bending dimension of each small screen according to the trial assembly condition, so that the panel bending dimension between adjacent small screens meets large screen assembling requirement; after the small screens are corrected and qualified, completing welding of the original unwelded steel flat fillet weld, and assembling a plurality of small screens into a large screen; and carrying out bulk heat treatment on a tube panel. The method disclosed by the invention can be used for solving the problem that a crack can be easily produced in a bend region in a panel bending process and also can be used for solving the problem that a panel bending bend is difficult to correct at relatively low temperature.
Description
technical field [0001] The invention belongs to the technical field of boiler membrane wall tube panel manufacturing, and more specifically relates to a row-bending method for membrane type wall tube panels manufactured from high-grade materials such as bainite steel or martensitic steel. Background technique [0002] With the improvement of power plant boiler parameters, the grade of water-cooled wall materials is also continuously improved, especially with the development of high-parameter boiler technology, the upper water-cooled wall material uses bainitic steel or martensitic steel, due to the strength of this material High and the standard has very strict requirements on the deformation temperature, which brings great difficulty to the manufacture of rows of bends in the water-cooled wall. [0003] Most of the current water-cooled wall tube panels are made of carbon steel and low-alloy steel tubes, and the wall thickness of the tubes is relatively thin, so it is easier...
Claims
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IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 王冬平刘丽兰银润邦奚旭刘国辉吕孝男钟学矫
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP